Cyberdemons are enemy monsters found in the computer game Doom. The Cyberdemons resemble large, 10+ foot tall brown-skinned minotaurs, somewhat resembling the weaker Baron of Hell monster, with several unnatural cyborg enhancements, including a mostly metallic right leg, a prosthetic rocket launcher for a left forearm, wires lining down their midsections, and wires protruding from the right shoulder areas. They are one of the most popular boss creatures in the history of first-person shooter games, and one has even appeared on the box art and the title screen of Doom II. Cyberdemons attack the player by using their arm-mounted rocket launcher with UAC-style rockets, which are shot in threes, one at a time, per attack. The rockets also have splash damage, allowing them to damage players with missed, but close detonations. The Cyberdemon's attack is extremely powerful (even on the lower difficulty settings), and only one or two direct hits will kill even a well armored player.

The Cyberdemon was originally designed as the end-of-chapter boss of the original Doom's Episode 2, in level 8: "Tower of Babel", where the cybernetic horror is awaiting the player in the courtyard section of the level, sometimes flanked by Lost Souls. It would only make one additional appearance in the original Doom in Episode 3's secret level, but several Cyberdemons would appear in the sequels, Doom II, Ultimate Doom, Final Doom and Doom 3.

The Doom manual lists them as "Half unfeeling machine, half raging horned devil. This walking nightmare has a rocket launcher for an arm and will definately [sic] reach out and touch you. Make sure you're loaded for bear before you get to this guy."

The Doom II manual lists them as "A missile-launching skyscraper with goat legs. 'Nuff said."

Strength

Cyberdemons are the strongest of all monsters in Doom and its sequels. In fact, one of the later levels in Doom II was built around a battle between a Cyberdemon and the Spider Mastermind (the final boss of the original Doom) in which the Cyberdemon would almost always win; only the Icon of Sin (which is not technically a true monster) can possibly pose more of a threat than a Cyberdemon. Cyberdemons have 4000 HP, signifying their mass endurance. It takes roughly either 45 Rockets, 400 Bullets, 200 Plasma Cells, 58 Shotgun Shells, 267 Cacodemon Gasballs, 134 Baron Plasma Balls, 100 Revenant Missiles, or 3 BFG9000 shots to kill a Cyberdemon (assuming all are direct hits with no misses).

Weakness

Even though it is the strongest monster in the game, veteran players can these days easily take on pairs or even trios of Cyberdemons at once, using a technique known as circlestrafing, allowing them to dodge their rockets (this is particularly easy when playing with a mouse/keyboard combination, so you can turn with the mouse and strafe with the keyboard). Although the rockets also have additional splash damage, veteran players usually try as best as often to lure Cyberdemons into open spaces where they don't have too many walls around to worry about splash damage from the missiles. Another interesting note is due to DOOM logic, Cyberdemons are immune to their own rockets and the rockets of other Cyberdemons, despite the player's own rockets being able to hurt them, so the player cannot use monster infighting to turn them against each other, since they lack a close-range attack.

Appearance statistics

On the Ultra-Violence skill level, Cyberdemons make the following appearances (in single-player games):

• 1 in Episode 2 of Doom (in E2M8)
• 1 in Episode 3 of Doom (in E3M9)
• 3 in Episode 4 of Doom (1 in E4M2, 1 in E4M6, 1 in E4M7)
• 5 in Doom 2 (1 in MAP08, 1 in MAP10, 1 in MAP20, 1 in MAP29, 1 in MAP32)
• 6 in Final Doom: TNT (1 in MAP13, 1 in MAP18, 1 in MAP21, 1 in MAP30, 1 in MAP31, 1 in MAP32)
• 23 in Final Doom: Plutonia (1 in MAP06, 1 in MAP12, 1 in MAP19, 1 in MAP24, 1 in MAP29, 1 in MAP30, 4 in MAP31, 13 in MAP32)
• 1 in Doom 3 (HELLHOLE.MAP (final level))

The Cyberdemon in Doom 3

The Cyberdemon returns with a new design in Doom 3. It is the final boss of the game, and — unlike its original counterpart — cannot be hurt with conventional firepower; instead, the player has to utilize Doom 3's most powerful weapon, the Soul Cube, to kill it.

Many players complained about the fact that the Cyberdemon is no longer vulnerable to the other weapons, and thus, a mod was released just some weeks after Doom 3's release that made the new Cyberdemon vulnerable to conventional weapons again.